I had a similar sounding problem with my BN4 years ago. It turned out to be fuel
starvation caused by the heat from the engine affecting the fuel feed.
If that is what it is - and your are interested in concours - then you may not
like the solution: we fitted a heat deflector (in essence an piece of bent ally,
but properly made) to keep enough heat away from the fuel line. You might
achieve the same effect by re-routing the fuel feed further from the engine.
Peter
On 16/07/2015 19:32, Michael Salter wrote:
> I have done the following;
>
> STEPS TAKEN TO FIND RUNNING PROBLEM
>
> This car has an original cap, original wires, original NA8 spark plugs,
> original
> black coil, original fuel pump. I am determined not to change any of these
> original parts unless I can confirm definitely that that item is the source of
> the problems?it a concours issue!!
>
> After many short trips 10 ? 15 miles etc... the engine started to run very
> badly
> after 35 odd miles of a longer test drive on a warm but not hot day after
> travelling over a few hundred meters of rough road under construction
> eventually
> stopping completely as I tried to climb a hill. Sounded to be running on 2
> cylinders at times. Backfiring through exhaust? no throttle response.
>
> Cranked but would not start..Appeared to have spark at the coil wire..
>
> Affer cooling started out again?after 20 odd miles stopped with the same
> symptoms? pulling choke seemed to make no difference.
>
> Could not hear fuel pump ticking but had fuel pressure at the front
> carb??good
> spark at coil wire?spark at plugs looked thin ?Changed the condenser and the
> rotor and it started reluctantly and ran well for about 15 miles then stopped
> again?.same symptoms?.changed rotor?ran for 2 miles same symptoms?
>
> Found ?3 cut? washers under the carb float chamber struts which I think could
> be
> sealing off the vent slots for the float chambers?
>
> Next day, today, I headed out for another extended drive and the car ran
> perfectly on a similar day for 36 miles then repeated the problem after 36
> miles
> and I just managed to nurse it home another 11 miles?.it actually died as I
> approached our driveway and I coasted in with the ignition turned off.
> Nothing
> would make it start.
>
> Tested the coil 4.6 ohms with no short to ground. Took off the float chamber
> lids and both were full to the correct level. The engine cranked but would
> just
> not start..
>
> After checking everything I could think of I believe that I have found the
> problem but I don?t have time to do another 36 mile test before loading the
> car
> to take to Enclave?
>
> What do you think I found?
>
>
> Michael..
>
> --
> /If you can't fix it with a hammer, you've got an electrical problem./
>
>
>
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--
===========================================================
Dr Peter Dzwig
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